tools/thermal/lib/uptimeofday.c

Source file repositories/reference/linux-study-clean/tools/thermal/lib/uptimeofday.c

File Facts

System
Linux kernel
Corpus path
tools/thermal/lib/uptimeofday.c
Extension
.c
Size
735 bytes
Lines
41
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: LGPL-2.1+
// Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org>
#include <stdio.h>
#include <sys/time.h>
#include <linux/sysinfo.h>
#include "thermal-tools.h"

static unsigned long __offset;
static struct timeval __tv;

int uptimeofday_init(void)
{
	struct sysinfo info;

	if (sysinfo(&info))
		return -1;

	gettimeofday(&__tv, NULL);

	__offset = __tv.tv_sec - info.uptime;

	return 0;
}

unsigned long getuptimeofday_ms(void)
{
	gettimeofday(&__tv, NULL);

	return ((__tv.tv_sec - __offset) * 1000) + (__tv.tv_usec / 1000);
}

struct timespec msec_to_timespec(int msec)
{
	struct timespec tv = {
		.tv_sec = (msec / 1000),
		.tv_nsec = (msec % 1000) * 1000000,
	};

	return tv;
}

Annotation

Implementation Notes